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The Narita express (NEx) is the easiest and fastest way to get from NRT to Tokyo. There used to be a pass that combined the NEx with a Suica (public transit card), however I believe it has been discontinued. You may buy the tickets at the JR East office in either Terminal One or Two at NRT. Looking online, it appears there is a discounted pass From NRT to Tokyo (http://www.jreast.co.jp/e/pass/nex_oneway.html for more information) it is ¥1500 ($15.00 USD) JR East also sells a 5 day rail pass and a Tokyo Metropolitan Area pass which may be of interest to you.

After you pass through customs and enter the arrival hall, you'll see ticket sales for the airport busses. There are several to choose from. Take the one that goes closest to your hotel and take a taxi the rest of the way. I believe the prices are about $20USD one-way.

The staff speak decent English and will guide you about which platform to stand on and will assist you with your luggage.

Take the Airport Limousine Bus. It costs around 3,000 JPY ($30 USD) per person. After exiting customs, look for the orange sign that says, "Airport Limousine Bus". It takes about 120 mins to downtown Tokyo. The Narita Express (train) is about the same but you have to transfer at Tokyo station which sucks if you have luggage.